public static boolean isOs()

in src/main/java/org/apache/commons/exec/OS.java [193:267]
67 lines of code
37 McCabe index (conditional complexity)

    public static boolean isOs(final String family, final String name,
                               final String arch, final String version) {
        boolean retValue = false;

        if (family != null || name != null || arch != null || version != null) {

            boolean isFamily = true;
            boolean isName = true;
            boolean isArch = true;
            boolean isVersion = true;

            if (family != null) {
                //windows probing logic relies on the word 'windows' in
                //the OS
                final boolean isWindows = OS_NAME.contains(FAMILY_WINDOWS);
                boolean is9x = false;
                boolean isNT = false;
                if (isWindows) {
                    //there are only four 9x platforms that we look for
                    is9x = OS_NAME.contains("95")
                            || OS_NAME.contains("98")
                            || OS_NAME.contains("me")
                            //wince isn't really 9x, but crippled enough to
                            //be a muchness. Ant doesn't run on CE, anyway.
                            || OS_NAME.contains("ce");
                    isNT = !is9x;
                }
                if (family.equals(FAMILY_WINDOWS)) {
                    isFamily = isWindows;
                } else if (family.equals(FAMILY_9X)) {
                    isFamily = isWindows && is9x;
                } else if (family.equals(FAMILY_NT)) {
                    isFamily = isWindows && isNT;
                } else if (family.equals(FAMILY_OS2)) {
                    isFamily = OS_NAME.contains(FAMILY_OS2);
                } else if (family.equals(FAMILY_NETWARE)) {
                    isFamily = OS_NAME.contains(FAMILY_NETWARE);
                } else if (family.equals(FAMILY_DOS)) {
                    isFamily = PATH_SEP.equals(";") && !isFamily(FAMILY_NETWARE);
                } else if (family.equals(FAMILY_MAC)) {
                    isFamily = OS_NAME.contains(FAMILY_MAC)
                            || OS_NAME.contains(DARWIN);
                } else if (family.equals(FAMILY_TANDEM)) {
                    isFamily = OS_NAME.contains("nonstop_kernel");
                } else if (family.equals(FAMILY_UNIX)) {
                    isFamily = PATH_SEP.equals(":")
                            && !isFamily(FAMILY_VMS)
                            && (!isFamily(FAMILY_MAC) || OS_NAME.endsWith("x")
                            || OS_NAME.contains(DARWIN));
                } else if (family.equals(FAMILY_ZOS)) {
                    isFamily = OS_NAME.contains(FAMILY_ZOS)
                            || OS_NAME.contains("os/390");
                } else if (family.equals(FAMILY_OS400)) {
                    isFamily = OS_NAME.contains(FAMILY_OS400);
                } else if (family.equals(FAMILY_VMS)) {
                    isFamily = OS_NAME.contains(FAMILY_VMS);
                } else {
                    throw new IllegalArgumentException(
                            "Don\'t know how to detect os family \""
                                    + family + "\"");
                }
            }
            if (name != null) {
                isName = name.equals(OS_NAME);
            }
            if (arch != null) {
                isArch = arch.equals(OS_ARCH);
            }
            if (version != null) {
                isVersion = version.equals(OS_VERSION);
            }
            retValue = isFamily && isName && isArch && isVersion;
        }
        return retValue;
    }